require_libfreetype
pkg-config --exists --print-errors freetype2
check_ld cc -I/usr/include/freetype2 -lfreetype
check_cc -I/usr/include/freetype2
BEGIN /tmp/ffconf.yxZMpbrz.c
    1   #include <ft2build.h>
    2   #include FT_FREETYPE_H
    3   long check_func(void) { return (long) FT_Init_FreeType; }
    4   int main(void) { return 0; }
END /tmp/ffconf.yxZMpbrz.c
x86_64-pc-linux-gnu-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -march=k8 -mtune=core2 -O2 -pipe --static -fPIE -march=core2 -std=c99 -fomit-frame-pointer -fPIC -pthread -I/usr/include/freetype2 -c -o /tmp/ffconf.2GRQn9U5.o /tmp/ffconf.yxZMpbrz.c
x86_64-pc-linux-gnu-gcc -Wl,--as-needed -Wl,-z,noexecstack -I/usr/include/freetype2 -o /tmp/ffconf.Jnd1zRsk /tmp/ffconf.2GRQn9U5.o -lfreetype -lfaac -laacplus -lm -llzma -lbz2 -lz -pthread -static
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x43a1): undefined reference to `png_create_read_struct'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x43b8): undefined reference to `png_create_info_struct'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x43da): undefined reference to `png_set_longjmp_fn'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x43ff): undefined reference to `png_destroy_read_struct'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4443): undefined reference to `png_set_read_fn'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4452): undefined reference to `png_read_info'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4490): undefined reference to `png_get_IHDR'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4532): undefined reference to `png_destroy_read_struct'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x456f): undefined reference to `png_set_palette_to_rgb'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x458f): undefined reference to `png_get_valid'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x45db): undefined reference to `png_set_filler'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x45ea): undefined reference to `png_read_update_info'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4628): undefined reference to `png_get_IHDR'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x465d): undefined reference to `png_set_read_user_transform_fn'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x46db): undefined reference to `png_read_image'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x46f7): undefined reference to `png_read_end'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4706): undefined reference to `png_set_interlace_handling'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4715): undefined reference to `png_set_gray_to_rgb'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4724): undefined reference to `png_set_packing'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4733): undefined reference to `png_set_tRNS_to_alpha'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4742): undefined reference to `png_set_expand_gray_1_2_4_to_8'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4751): undefined reference to `png_set_strip_16'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `Load_SBit_Png':
(.text+0x4795): undefined reference to `png_set_read_user_transform_fn'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `error_callback':
(.text+0x4855): undefined reference to `png_get_error_ptr'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `error_callback':
(.text+0x486d): undefined reference to `png_set_longjmp_fn'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `read_data_from_FT_Stream':
(.text+0x9892): undefined reference to `png_get_io_ptr'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `read_data_from_FT_Stream':
(.text+0x98db): undefined reference to `png_get_error_ptr'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/libfreetype.a(sfnt.o): In function `read_data_from_FT_Stream':
(.text+0x98eb): undefined reference to `png_error'
collect2: error: ld returned 1 exit status
ERROR: freetype2 not found